I just think its part of the bigger picture. Having this released at such odd of a time suggests it'll be part of the N5 when it is released. Think about it. If we already buy the harddrive and whatever else with it, perhaps Nintendo will use it with the N5, thus keeping the N5s price lower because it'll be the N5 only-no HD or anything because you would already have it.
By the way, SPONG.COM is now reporting that there will be a press coference between the 15th and 19th of January showcasing 'new' hardware. So we may know shortly what this is all about.